Pipe stretch-bending, curling and forming device and method

The invention discloses a pipe stretch-bending, curling and forming device and method, which is used for preparing a metal belt into a hollow pipe or a core-filled pipe by stretch-bending and curling. The device comprises an uncurling device, a friction damping device, a guide roller, a stretch-bending and curling device, a clamping roller, a welding device, a continuous rolling unit, an annealing device and a material collecting device which are sequentially arranged in a penetration direction of the metal belt, wherein the stretch-bending and curling device comprises a mould main body; one end of the mould main body is provided with a first feeding hole; the other end of the mould main body is provided with a sizing cavity; the first feeding hole is provided with a limiting end cover; the inner part of the mould main body is provided with a rotary curved-surface working cavity in the axial direction; the metal belt is fed from the first feeing hole, is curled under the action of the rotary curved-surface wo